I organized the class contents. 52 weeks of exchange rate and dollar index data are available for download from Investing dotcom. [Check dollar investment timing] 1) When the current exchange rate is lower than the average exchange rate of 52 weeks 2) When the current dollar index is below the 52-week average dollar index 3) The current dollar gap ratio is higher than the 52 week average dollar gap ratio 4) When the current exchange rate is lower than the appropriate exchange rate* * Appropriate exchange rate: current dollar index / 52 weeks average dollar gap ratio × 100